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| author | Even Rouault <even.rouault@spatialys.com> | 2019-08-15 15:05:28 +0200 |
|---|---|---|
| committer | Even Rouault <even.rouault@spatialys.com> | 2019-08-15 15:05:28 +0200 |
| commit | 4bb584a35f87af42d6cf09d15e9ce8909a839145 (patch) | |
| tree | 4d2a80c1e5b72fd6a7d794fc859920d1971e8329 | |
| parent | 2218055ca67d84be596a13080e8f50f22116555c (diff) | |
| download | libtiff-git-4bb584a35f87af42d6cf09d15e9ce8909a839145.tar.gz | |
RGBA interface: fix integer overflow potentially causing write heap buffer overflow, especially on 32 bit builds. Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=16443. Credit to OSS Fuzz
| -rw-r--r-- | libtiff/tif_getimage.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/libtiff/tif_getimage.c b/libtiff/tif_getimage.c index c88b5fa6..4da785d3 100644 --- a/libtiff/tif_getimage.c +++ b/libtiff/tif_getimage.c @@ -949,16 +949,23 @@ gtStripContig(TIFFRGBAImage* img, uint32* raster, uint32 w, uint32 h) fromskew = (w < imagewidth ? imagewidth - w : 0); for (row = 0; row < h; row += nrow) { + uint32 temp; rowstoread = rowsperstrip - (row + img->row_offset) % rowsperstrip; nrow = (row + rowstoread > h ? h - row : rowstoread); nrowsub = nrow; if ((nrowsub%subsamplingver)!=0) nrowsub+=subsamplingver-nrowsub%subsamplingver; + temp = (row + img->row_offset)%rowsperstrip + nrowsub; + if( scanline > 0 && temp > (size_t)(TIFF_TMSIZE_T_MAX / scanline) ) + { + TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "Integer overflow in gtStripContig"); + return 0; + } if (_TIFFReadEncodedStripAndAllocBuffer(tif, TIFFComputeStrip(tif,row+img->row_offset, 0), (void**)(&buf), maxstripsize, - ((row + img->row_offset)%rowsperstrip + nrowsub) * scanline)==(tmsize_t)(-1) + temp * scanline)==(tmsize_t)(-1) && (buf == NULL || img->stoponerr)) { ret = 0; @@ -1051,15 +1058,22 @@ gtStripSeparate(TIFFRGBAImage* img, uint32* raster, uint32 w, uint32 h) fromskew = (w < imagewidth ? imagewidth - w : 0); for (row = 0; row < h; row += nrow) { + uint32 temp; rowstoread = rowsperstrip - (row + img->row_offset) % rowsperstrip; nrow = (row + rowstoread > h ? h - row : rowstoread); offset_row = row + img->row_offset; + temp = (row + img->row_offset)%rowsperstrip + nrow; + if( scanline > 0 && temp > (size_t)(TIFF_TMSIZE_T_MAX / scanline) ) + { + TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "Integer overflow in gtStripSeparate"); + return 0; + } if( buf == NULL ) { if (_TIFFReadEncodedStripAndAllocBuffer( tif, TIFFComputeStrip(tif, offset_row, 0), (void**) &buf, bufsize, - ((row + img->row_offset)%rowsperstrip + nrow) * scanline)==(tmsize_t)(-1) + temp * scanline)==(tmsize_t)(-1) && (buf == NULL || img->stoponerr)) { ret = 0; @@ -1079,7 +1093,7 @@ gtStripSeparate(TIFFRGBAImage* img, uint32* raster, uint32 w, uint32 h) } } else if (TIFFReadEncodedStrip(tif, TIFFComputeStrip(tif, offset_row, 0), - p0, ((row + img->row_offset)%rowsperstrip + nrow) * scanline)==(tmsize_t)(-1) + p0, temp * scanline)==(tmsize_t)(-1) && img->stoponerr) { ret = 0; @@ -1087,7 +1101,7 @@ gtStripSeparate(TIFFRGBAImage* img, uint32* raster, uint32 w, uint32 h) } if (colorchannels > 1 && TIFFReadEncodedStrip(tif, TIFFComputeStrip(tif, offset_row, 1), - p1, ((row + img->row_offset)%rowsperstrip + nrow) * scanline) == (tmsize_t)(-1) + p1, temp * scanline) == (tmsize_t)(-1) && img->stoponerr) { ret = 0; @@ -1095,7 +1109,7 @@ gtStripSeparate(TIFFRGBAImage* img, uint32* raster, uint32 w, uint32 h) } if (colorchannels > 1 && TIFFReadEncodedStrip(tif, TIFFComputeStrip(tif, offset_row, 2), - p2, ((row + img->row_offset)%rowsperstrip + nrow) * scanline) == (tmsize_t)(-1) + p2, temp * scanline) == (tmsize_t)(-1) && img->stoponerr) { ret = 0; @@ -1104,7 +1118,7 @@ gtStripSeparate(TIFFRGBAImage* img, uint32* raster, uint32 w, uint32 h) if (alpha) { if (TIFFReadEncodedStrip(tif, TIFFComputeStrip(tif, offset_row, colorchannels), - pa, ((row + img->row_offset)%rowsperstrip + nrow) * scanline)==(tmsize_t)(-1) + pa, temp * scanline)==(tmsize_t)(-1) && img->stoponerr) { ret = 0; |